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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+import { EventEmitter } from "resource:///modules/syncedtabs/EventEmitter.sys.mjs";
+
+/**
+ * SyncedTabsDeckStore
+ *
+ * This store keeps track of the deck view state, including the panels and which
+ * one is selected. The view listens for change events on the store, which are
+ * triggered whenever the state changes. If it's a small change, the state
+ * will have `isUpdatable` set to true so the view can skip rerendering the whole
+ * DOM.
+ */
+export function SyncedTabsDeckStore() {
+ EventEmitter.call(this);
+ this._panels = [];
+}
+
+Object.assign(SyncedTabsDeckStore.prototype, EventEmitter.prototype, {
+ _change(isUpdatable = false) {
+ let panels = this._panels.map(panel => {
+ return { id: panel, selected: panel === this._selectedPanel };
+ });
+ this.emit("change", { panels, isUpdatable });
+ },
+
+ /**
+ * Sets the selected panelId and triggers a change event.
+ *
+ * @param {string} panelId - ID of the panel to select.
+ */
+ selectPanel(panelId) {
+ if (!this._panels.includes(panelId) || this._selectedPanel === panelId) {
+ return;
+ }
+ this._selectedPanel = panelId;
+ this._change(true);
+ },
+
+ /**
+ * Update the set of panels in the deck and trigger a change event.
+ *
+ * @param {Array} panels - an array of IDs for each panel in the deck.
+ */
+ setPanels(panels) {
+ if (panels === this._panels) {
+ return;
+ }
+ this._panels = panels || [];
+ this._change();
+ },
+});